@SimpleJack - your best bet would be probably Ideally Generic Viagra or even the real thing if you can afford it. Take it about 45mins-1hour before your Penis Enlargement session.
Alot of newer people dont realise you must stay sexually arroused while pumping and really any girth work. With Viagra, its thoughtless to get an erection which makes girth work so much easier. Some people I have noticed have to be physically stimulating their penis to stay hard which makes it harder when pumping. Also some newer people dont realise but if you dont actually stay hard in a pump youre not getting the full potential of your pump sessions. Even for me (since I dont do alot of girth work in a pump) I will enter the pump hard pump up and it appears to stay hard due to the vaccumm suction, but once i leave the unit, I notice its only semi hard. This also causes faster fluid build up in my experience and less bloodflow and tissue expansion.
Now another option if you dont have a problem staying hard in a pump (go in hard, pump for 15-20mins and when you exit the pump youre still rock hard) then something like the [words=http://www.mattersofsize.com/join-now.html]TiTan[/words] pills offered here at [words=http://www.mattersofsize.com/join-now.html]MOS[/words] would be a good product for you.
basically the [words=http://www.mattersofsize.com/join-now.html]TiTan[/words] pills and any natural aphrodisiac are very similar to Cialis in how they act (also a viable generic option). basically they dont make you hard on the spot like viagra, but keep a constant moderate bloodflow to your penis throughout the day. Thus giving a more plump look all day even if you are on a rest day. they do make it easier to obtain a longer lasting and harder erection.
Im sure others can give you more detailed information on how herbal pills and cialis work but this is kind of the beginer level information that should hopefully answer your question.
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CynicZ